@openstreetmap/id-tagging-schema/data/fields/content.json

The OpenStreetMap tagging model used by the iD editor

{
    "key": "content",
    "type": "combo",
    "label": "Content",
    "options": [
        "silage",
        "water",
        "oil",
        "fuel",
        "slurry",
        "gas",
        "manure",
        "sewage"
    ],
    "autoSuggestions": false
}